Free-wheel hub with brake device



Aug- 27, 1935; H. SCHMIDT ET AL 2,012,893

FREEWHEEL HUB WITH BRAKE DEVICE Filed Oct. 24, 1955 Inventors W i M ZMvM/M "'M M m Patented Aug. 27, 1935 l FREE-WHEEL HUB WITH BRAKE DEVICE "Hermann schmiat,'suh1, and Hans schmidt, ,l Jena', Germany f Applicatinfoctber 24, V1933, serial No. 694,946 e InGermany October 26, 1932 L' 'I'he invention relates to a vfree wheel hub with coaster brake particularly for bicycles and-'like vehicles. In hubs of thistype thebrake is appliedby back-pedalling whereby the driver in its'. backward rotation operates intermediate parts which apply the brake member to the' inner face of the hub shell.l

In such appliances the brake automatically at once returns to its inoperative positionowing to Cil V its elas'ticityyso that the cyclist is compelled to' continuously press Vthe pedals backwards thereby causing a substantial fatigue of the cyclist on longy slopes.

The objectof theV invention is to so construct 115 the f-free wheel hub withY coaster brake that the brake is maintained operative, even when 'backpedallingceasesuso thatthel braking effect continues for any `selective time'.

"This object iss-attained by the provisionfof a locking device ywhich will, after backward rotationv of the driving member, immobilize thesaid member or a partV engaged with it in its braked position, thusv also'iholding the brake operative. Thenv the cyclist may'let his feet loosely rest and balance on the two pedals or take them off therefrom."

l"The engagement of the locking devicey may b made at williorautomatically. l

Inthevdrawing, which forms apart of this 30.l specicatiorntwo embodiments of the invention are illustrated by way of examples.

Fig. lis a sectional elevation onthe axis of a i 4Like numerals denote likeparts in` all iigures l l5r ofthe drawing. y K

Referring to Fig. 1,` the free-wheel hub-F with coaster brakec'omprises an axle d `which is in thelusual manner immovably mounted in a cycle frame, a r'driving member a rotatably supported- 5,0 onrthe axle by means of a ball bearing. acone member e non-rotatably xedupon the axle, and

a hub shell or casing f rotatably mounted fon.

the cone member e land the driver'a respectively,

as r`*for example by ball bearings.'` On a projection of the-driver agscre'w threads of high pitchgare provided threaded onto a coupling sleeve b" having female threads so that said sleeve is screwableztovthe rightgfas Vshown in Fig. 1 into engagement with lthe Ahubshell whenthe driver is rotated forwards through the pedals (not shown) r plingmember b is forcedtowards the cone rnexnf-g ber e.VV

or tothe left on backward `rotation of theldriueifeA An expansible lbrake A member c` composed f of interengaged sleeves is*` supported at its ends upon, the conical inner end of the memberl e andupon an adjacent cone face of,` the coupling,:lm ember,`

b respectively. 'I'heA said cones` arefjrthe panding means vfor the brake cwhichis applied to the inner face ofthe hub yshell when Athe @cou-Jv The appliance for locking the drivera, brake actuating position is composed ofa ed shiftably vmounted in a conical recess of the driver and on the axle d, andencircling anaxial slot sin the axle. A ilat pin h passing :througha radial bore of the cone g, ltheslotted -aXle der anvd a rod i located in a` central bore of the axleholds the4 cone g against rotation. A helical.` spring y' surrounding the rod i bears at one end against f an abutment ring r xedin the axle andtends 20T aty its other end -to urge thepin h ,to ythe .right as shown in Fig. 1. `To the outer lend of. ,the i by means of a flexible element, such as :achain i1, a Bowden cable with anadapter ,ofthe ,well

known construction is joined., By the operation The locking device operates `asffollows,r` '30,-

the cyclist hasnby'back-pedalling applied; the brake to the hub shell he kmay immobilize the driver a' and consequently the `brake ,in theirlrespective positions lby operating the Bowden` deb-,p vice in ordentodisplace the `rodji and the coneg to the leftY until thek coupling engagement ybe? tween the Vcone ly and the) female` c one-.fof `the f driver a isvobtained, as seen fromv Fig. 1. Then the braking effect isv maintained independently` of back-pressure on thepedals. Releasingtof Bowden devicecauses the spring 1' to automat: ically disconnect they locking device, sothatythe driver a can again be rotated. l l Fig. 2 yrepresents a modification of the `llocking device in which` the displacement ofr the locking "L, cone g* is automaticallyaccomplished bqthgon. pedalling backwards and forwards -for arresting and releasing the driver a respectively. `The, cone g, thepinh and theslot sare substantially,they same as hereabove described. `In, asecondsivrnilar 5,9, slot s1 a'block Z is axiallydisplaceableinunison H with the pin h to which it is connected byfa'screw m passingthrough a bore of the pin h andengag.- ing a female screw 4`thread .of the block' l. A heli?.

cal spring o holds the pin and block aparta,u To ,5,5,

the left side` of the coupling sleeveb bearSa shaped bush or ringA lck interconnected withjhe `block Z, the ends of which, as best seen fromqF ig4, t `'engage recesses` k1; Lof; the'member` Other,- ,ICH

cesses k2 permit the bush ktoxbedisconnected QQ angle of 90. :tire locking'dev-ice `to the right.

from the block l by a relative turning through an A spring 11. tends to displace the eny By 4turning the screw mthe'distance'between the pin h and block I may be varied in accordance with requirements. When the driver a; is rotated backwards the coupling sleeve b is displaced to the leftby the screw threads interconnecting these 'twopar'ts y:

The sleeve b is prevented from lrotating with the driver owing to its frictional contact withlthe non-rotatable ring Ic. By this displacement expanding 'of the brake andlaxial shiftingiof `the n A the spring n will 'at the beginning of back pedallingfbe 'allowed to shift `the cone g at once to the figlia/"therebyuncoupling the driver, 'so that the increase vcffefort is required Aonlyffor ya minimum cf'tim'eI 'Thefriction in the several parts var 'ranged between the driverfand brake will assist theTlock-ing -eiect so that the engagement ofthe lookingdevice is done rather smoothly. Y

` Whatwe claim as new, and desire to secure'by llietters?Patent,'is-` `-1."'In "a free-wheel hub with v,brake device, a

driver, brake actuating means, vtransmitting means; clarn-rii-ng or'irnmobilizing means comprisingfa'slidable non-rotatable member, a pin passi-rigtlnpugh a slot 'in this member andfin the hub respectively,l av-second pin passing through l anotherhsloti-n the said hub'axle, a longitudinal 'iiiftlie'said axle, a member housed lin this bore andr connecting the 'first `and the second pins,

,l curve surfaces adapted to displace the second pin y when back-'pedall'ing takesplace so as to cause second pin to operate the said clamping or immobii'iz'ing means.

`affree-wheel hub with brake device, aA driver `having a female conerecess, clamping adapted to immobilize lthe said driver by being pulled into the female cone recess thereof, ''.'lbrake' actuating double vconameans adapted to g'displace thesaid double cone intoY the braking position when the said driver is back-pedalled, a

' block 'adapted to frictionally-couple with 'the said doublelcone, a pullfr'od connecting the said blockk to 'the 'said clamping means, and means caused by the, said displacement of the double cone to 'pllfthe 'fsaidjclamping means into the said' female enefcf the driver by means ofthe said block Vand illfrod. j

"""SIn-fa freewheel hub with back-pedalling brake, the-combination with a stationary wheei axle, fof a ldriver rotatably mounted thereon, b'rakeeapplying and releasing meansoperated by rotating'the driver backwards o r forwards respectively, the said driver and brake-applying and releasing'vm'eans being interengagedand inter` connected coupling means adapted to immobilize 'automatically the driver and the brake-actuating and'releasingfmeans respectively, onerpart of said coupling means being carried by said brakef 'ctlatingand releasing means, while the other part 'i's4 4"n'ori-revohriolybut sniftaiiiyk mounted on theisaidwneeiane. fy

4. In combination, a wheel hub for a bicycle, a driver coaxial with said hub, means automatically responsivegto the forward Arotation of said driver for transmitting drivingpower from said driver to said hub, means automatically respon- .sive to a back pedalling action on said driver for lbraking said hub, and means for locking said l'fdriver in back pedalled or braking position, ywhereby in said latter position the hub will be braked without a continued application of backv pedalling pressure.

5. In combination, a wheel hub for a bicycle,

.a driver, brake applying and brake releasing means operated automatically for applying a brake to said hub upon forward rotation of said I.

tion, may be immobilized irrespective of back' pedalling pressure on said driver. i

l6. Incombination, a wheel axle for a bicycle, a wheel hub encircling said-axle, a driver for said hub concentric withl and rotatable about said axle, brake applying and brake releasing meansfor said hub and operated by said driver, a locking member mounted for movement along 'said axle; and means for moving said locking member lengthwise of said ax-leinto or out of lockingr position with respect to said driver, whereby said driver may be immobilized vwithouta continued application of manual Vbraking pressure.

'7. In combination, a .wheel hub for a bicycle, a driver coaxial with said hubfmeans automatically responsive to the forward rotation of said driver for` transmitting driving Apower from `said driver to said hub, means automatically responsive to a back pedalling action on said driver for braking: said hub, Aand means Vautomatically responsive to the back pedalling action on said driver for locking said driver in back pedall'ed or braking position, whereby in said latter posi'- tion the hub willbe braked without a continued application of back pedalling pressure.

8. In combination` a wheel axis for a bicycle, a wheel hub'supported on saidfaxle, a 'driver rotatable lon said axle, means for transmitting power from said driver to said hub' upon forward rotation of said driver, means responsive toback pedalling action-on saiddriver for braking said hub, a locking member mounted on said axle for lengthwise movement therealon'g and having a,

and releasing means for said hub automatically operated by said driver, a locking member mounted for'axial movement with respect to said driver and having a conical surface corresponding to the conical surfaceof said recess, and means for moving said locking member to effect interengagement ofy said conical surfaces to immobilize said driver when said driver is in braking position.

H'ANs soin/mor.

HERMANN scm/nm'. 

